Sound Not Working on Mac Headphones - Ubuntu

I plugged in my headphones to my Intel Macbook running Ubuntu Intrepid and nothing...not a sound. I knew there was sound because when I unplugged the headphones, the sound came through without problem.

To get the sound going again, I had to do the following at the command line:

1) sudo apt-get install gnome-alsamixer
and then opened
2) Applications:Sound & Video: GNOME ALSA Mixer
3) And turned off MUTE in the SURROUND section as shown in the screenshot above.

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